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(WN) Southwest Airlines 4253 On-Time Performance Rating

Date Range:

15-Mar-2026 to 15-May-2026

(SJC) San Jose Mineta International Airport

San Jose, CA, US

(ONT) Ontario International Airport

Ontario, CA, US

On-Time Performance Chart

(using rounded numbers)
On-Time
38
97%
Late
0
0%
Very Late
1
3%
Excessive
0
0%
Cancelled
0
0%
Diverted
0
0%

Delay Statistics

(Aggregate Arrival Delay Statistics for this Flight)

Total Flights Observed
39
Total Delays ( > 1 min )
2
Codeshares
0
Average Delay (min.)
21
Standard Deviation
17
Min
0
Max
33

WN 4253 On-Time Performance Details

Overall Rating
4.1 of 5
Good
Percentage On-Time 97%
Average Delay Time 21 min
FlightStats Rating is a merit measurement considering both on-time performance and delay severity. The score, 4.1 shows that this flight has on-time performance characteristics better than 80% of all other flights in the FlightStats database.
On-Time Performance Rating
5.0 of 5
Very Good
Percentage On-Time 97%
This flight has an on-time performance of 97%. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight is on-time more often than 100% of other flights.
Delay Performance
3.1 of 5
Average
Average Delay Time 21 min
This flight has an average delay of 21 minutes with a standard deviation of 17 minutes. Statistically, when taking into consideration sample size, standard deviation, and mean, this flight has delay performance characteristics better than 62% of other flights.

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